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Influence of environmental conditions on demand‐feeding behaviour of gilthead seabream ( Sparus aurata )
Author(s) -
Velázquez M.,
Zamora S.,
Martínez F. J.
Publication year - 2004
Publication title -
journal of applied ichthyology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.392
H-Index - 62
eISSN - 1439-0426
pISSN - 0175-8659
DOI - 10.1111/j.1439-0426.2004.00613.x
Subject(s) - evening , biology , darkness , photoperiodism , zoology , fishery , on demand , ecology , botany , economics , physics , astronomy , commerce
Summary We studied the demand‐feeding behaviour was studied of gilthead seabream ( Sparus aurata , L.) reared under either constant (25 ± 0.5°C, 12 : 12 L : D, control group) or natural (experimental group) temperature and photoperiod conditions during a period from winter to summer. Hourly demand‐feeding activity profiles were recorded using self‐feeding devices; these profiles showed that control group behaved entirely as a diurnal species, exhibiting no nightly activity and decreased demand rates in winter months. The experimental group did exhibit nightly activity (in incomplete darkness); this group also showed reduced demand rates in winter months, accompanied by a demand peak shift towards evening/night hours that followed the day's temperature peak of colder months.